What Are Skin Tags? Causes, Types, and When to Remove Them

A skin tag is a small, soft outgrowth of normal skin — a core of loose collagen fibres and tiny blood vessels wrapped in ordinary skin, hanging from the surface on a narrow stalk (doctors call the stalk a peduncle). Most are between one and five millimetres, skin-coloured or slightly darker, and completely benign: a skin tag is not a tumour in any worrying sense, is not caused by a virus, and cannot spread to other people or other parts of your body.

Because they are so common — a large share of adults develop at least one — skin tags have collected many names. You may see them called flesh tags, skin ticks, soft fibromas, or even 'skin maru'; the medical term is acrochordon. All describe the same harmless growth.

The strongest driver is friction. Skin repeatedly rubbing against skin, clothing, collars, or jewellery encourages these small outgrowths — which is exactly why tags cluster in the neck creases, underarms, eyelid area, under the breasts, and the groin. Where there is chronic gentle rubbing, tags follow.

Several other factors raise the odds. Tags become more common from the 30s and 40s onward, and a tendency to grow them clearly runs in families. Hormonal shifts — pregnancy is the classic example — can trigger a crop of new tags. And skin tags are seen more frequently in people with insulin resistance, elevated blood sugar, or higher body weight, which is why a sudden generous crop of new tags is occasionally a nudge to review general health, not just skin.

Skin tags are all variations of the same growth, but they present differently by site — and the site shapes both how bothersome a tag is and how removal is planned.

Usually not. People who are prone to skin tags typically accumulate more of them over the years, and an individual tag can slowly enlarge — both patterns are ordinary. A tag that twists on its stalk can also suddenly darken and become tender as its blood supply is pinched; this looks alarming but is usually the tag strangulating itself, and a doctor can remove it and settle the site.

What deserves attention is a growth behaving unlike your other tags. The point of a medical assessment is not that tags are dangerous — it is that other growths can impersonate them, and the impersonators matter.

Pharmacy wart-remover acids, freeze-at-home kits, tag-removal bands, and thread tying all promise a cheap fix — and all share the same two problems. First, they treat blind: none of them confirms the growth actually is a benign tag, and moles should never be burned, frozen, or tied off without assessment. Second, they trade a controlled, minutes-long clinic procedure for days or weeks of chemical irritation, broken skin, and a meaningfully higher chance of a lasting mark or infection.

In clinic, removal is straightforward. The doctor first examines each growth to confirm it is a benign tag — anything atypical is evaluated properly instead of removed on the spot. Confirmed tags are then removed under local anaesthesia, typically with a CO2 laser or electrocautery, taking the tag off at the base of the stalk. Multiple tags are commonly cleared in one visit, small scabs form at the treated spots, and simple aftercare sees most sites healed within one to two weeks.

Removal treats the existing tags; it does not change your underlying tendency to grow them, so people prone to tags may develop new ones over time. That is a maintenance conversation to have at assessment, not a failure of treatment.